Turbulent combustion - buoyant axisymmetric turbulent diffusion flames in still air
A theoretical and experimental study of buoyant, axisymmetric, turbulent diffusion flames is described. Measurements included profiles of mean velocity, velocity fluctuations, Reynolds stress, mean temperature, and mean concentrations for two flames having heat release rates of 1.67 and 8.51 kW, respectively. Flame shape and the variation of flame radiation along the axis were also measured. A portion of the measurements were compared with a k-/epsilon/-g turbulence model which was developed earlier and has been calibrated for a variety of combusting and noncombusting forced flows at relatively high Reynolds numbers. The model provides for buoyancy in the governing equations for mean quantities, but neglects effects of buoyancy on turbulence characteristics. The model provided an estimation of data trends; however, errors in the predictions were greater than for forced combusting flows. The greatest discrepancy involved the width of the flow in the upper portions of the flames, which the model underestimated by as much as 50%. 22 refs.
- Research Organization:
- Pa State Univ, University Park
- OSTI ID:
- 5287838
- Journal Information:
- Combust. Flame; (United States), Journal Name: Combust. Flame; (United States) Vol. 44:1-3; ISSN CBFMA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
CHEMICAL REACTION KINETICS
COMBUSTION KINETICS
FLAMES
FLUCTUATIONS
FLUID FLOW
KINETICS
MATHEMATICAL MODELS
REACTION KINETICS
TEMPERATURE DISTRIBUTION
TURBULENT FLOW
VARIATIONS
VELOCITY